Means for cooling dynamo-electric machines.



W. L. R. EMMET. MEANS FOR 000mm DYNAMO ELEOTRIG MACHINES. APPLICATION FILED AUG. 19. 1905 937,429. Patented 0ct.19,1909.

my. a L

Vgvessas j g I Mar/@745 27717 76 $6M W 41 5Q I UNITED STATES PATENT QFFICE.

WILLIAM L. R. EMMET, or scHENEcTADY, NEW YORK, ASSIGINOR T GENERAL ELEC- TRiocoMPANY, A CORPORATION or newryon c MEANS FOR COOLING LDYNAIVJIOJELEC'IIR-IC MACHINES.

To all whoni it may concern:

' Be it known that l, \Vnaaut L. R. En-

nm, a citizen of the l nitcd States, residing at. Schenecttuly, count y of Schenectady, btate of New iork, have lnvented certain 'new and useful Improvements in Means for (coling Dynaniii-Electric Machines, of which and it is-fonnd that the simplest and most effectual way is to wash-the heated parts in streams of air by which the heat is rapidly absorbed and carried away. The present in vention is applicable to difi'erent types of machines, but it has been especially designed for a generator arranged with its armature shaft vertical and driven by a steam turbine.Tlie high rate of revolution necessitated by the use of a turbine engine causes considerable heating of the genera-- tor, so that some cooling device is quite necessary. D

The invention consists in a fan rotating with the arn'iature inside of a cylindrical hood and drawing air currents into the .cas-

ing of the machine through chutes or spouts directed toward the currentcollecting device.

In the accompanying drawing, Figure 1 "is a side elevation of a direct current machine embodying my invention,shown partly in section. Fig. 2 is a side view of an air spout. Fig. 3 is an end view of the same. Fig. 4 is a cross section of a fan blade. Fig. 5 is a side view of the same, and Fig. dis a crosssection of a portion of the armature winding.

The fame of the gene 'ator illustrated comprises a base. 1 ada )ted to stand on the casing of a steam turbine (not shown), a cylindrical casing 2 supportedon said base,

and a conical skeleton top or-brack et 3 carry- Specification of letters Patent. Application tiled August 19, 1905. Serial No. 274,873.

closed by removable covers 12.

Patented Oct. 19, 1909..

winding 5) is connected with the commutator bars 10 in the usual manner. Each of the bars 0 consists of a plurality of wires insulated .with'a coating of flexible heat-resisting oil enamel and compresstal into a square bunj die. The winding is but one layer deep, the bat-sheila); laid side by side between low driving horns l-l. onjthe head 8. The current collecting deviccs in this machine comprise a commutator and cooperating brushes.

The (aanmutator is at the upper end of the generator and extends up into the top 3." In order toprotect the commutator, brushes and brush holders. the large openings between the ribs of said top are normally In one, two or more of said covers are air inlets, each provided with a chute or spout l3 projecting inwardly. and made preferably of sheet metal with a flange 14 secured to'the cover 1; around the edge of the air inlet. The 7 spouts are inclined downwardly in order to direct the inl'lowing streams of air upon the commutator.

In order to induce a How of air into the casing. there is provided at some suitable point. a tan revolving with the armature. I prefer to provide the lower head 8 with a cylilnlrical flange l5 concentric with the. sbat't. which flai'ige supports the windings ot the armature and has secured thereto by screws 1c theradial arms 17 each carrying a tan-blade 18, preferably slightly curved in cross-section, The arms 17 extend outwardly and the tan-blades revolve inside a cylindrical hood of sheet metal secured to the frame of the machine concentric with the The tan-blades are so inclined that when the generator is running they cause a flow of air in through the sponts 13,.down over the commutator, through the air-gap between the field-magnet poles and the armature winding and through the passages 19 in the'heads S an the core of the armature: thereby washing away the heat and keeping these parts reasonably cool in spite of their high speed.

.\s stated above. 'the airinlet spouts are preferably mounted on covers which till the openings between the ribs of the shatt-bearing bracket. But in some sizes of machines. it may be preferable to cast one or more of said covers integral with the bracket.

\Vhat ll ehiiinns new and desire To b Y Letters Patent 01 the Unree Elliot 7 1 1. In a dynamo electric machine, "he coinblniltlOn with a casing, of EL SlE-QlLUbfiillln bracket therefor the currentcollecting on of said machine, ribs on bracket, said bracket havnw onenin s between lllS ribs 1 .L 23 7 covers 1'01 said openings having an inlets, spouts pi'ogectlng inwardly from said inlets and directed toward the current collecting devices and. ten on the o nosite end of the a l machine.

2. The con'ioinat-ion with a dynamo elec .tric machine having a casing, of a shaft bearing bracket at the commutator cm of said casing having; air-inlets, spouts for said inlets projecting towurd the coinummlci', a cylindrical flange on the opposite end of lhc armature, redial fan-blades l'l'lOllIltGk'l on said flange, and a cylindrical hood secured to the 

